Building owners and operators should consider installing separate submeters to
measure specific end uses that are permanently plumbed, as indicated in Table 2-1.
For more information and additional recommendations on metering and subme-
tering, review the U.S. Green Building Council’s LEED® rating system
and the 2012
International Green Construction Code.™
Table 2-1. Submetering Recommendations
Metering and Submetering
International Code Council.
International Green Construction Code
Meter all tenant spaces individually.
Meter cooling tower make-up water and blowdown water
supply lines. A single make-up meter and a single blowdown
meter can record flows for multiple cooling towers if they are
controlled with the same system. Separately controlled cool-
ing towers should have separate make-up and blowdown
and Air Conditioning
Individually or collectively meter HVAC systems with ag-
gregate annual water use of 100,000 gallons or more or if
the facility has 50,000 square feet or more of conditioned
space. Metered systems should include evaporative coolers,
humidifiers, mist cooling devices, and recirculating water
systems with a fill water connection, such as chilled water,
hot water, and dual temperature systems.
Meter the make-up water supply line to steam boilers with
a rating of 500,000 British thermal units per hour (Btu/h) or
greater. A single make-up meter can record flows for mul-
Meter any systems or equipment that use single-pass cool-
ing water and do not use a chilled water system or closed-
Meter irrigation systems that are automatically controlled.
Roof Spray Systems
Meter roof spray systems for irrigating vegetated roofs or
Meter make-up water supply lines for ornamental water
features with a permanently installed water supply.
Pools and Spas
Meter make-up water supply lines for indoor and outdoor
pools and spas.
Individually meter industrial processes consuming more
than 1,000 gallons per day on average.